Figure 10. LM and SEM micrographs of pollen grains. (a4)-(d4) Quercus turbinella (e4)-(f4) Quercus sadleriana (g4)-(h4) Quercus vacciniifolia (i4)-(l4) Quercus wislizeni (m4)-(o4) Quercus X alvordiana (p4)-(s4) Quercus X macdonaldii (t4)-(u4) Chrysolepis chrysophylla (t4)-(u4) Notholithocarpus densiflorus var. echinoides